namespace System.Text.RegularExpressions
{
    [DefaultMember("Item")]
    public class GroupCollection : ICollection<Group>, IEnumerable, IEnumerable<KeyValuePair<string, Group>>, IEnumerable<Group>, IList<Group>, IReadOnlyCollection<KeyValuePair<string, Group>>, IReadOnlyCollection<Group>, IReadOnlyDictionary<string, Group>, IReadOnlyList<Group>, ICollection, IList
    {
        public IEnumerable<string> Keys { get; }
    }
}